JPH0213815Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an antifreeze faucet having a pressure reducing mechanism used in cold regions.

(Prior Art) Conventionally, in cold regions, it has been common practice to use antifreeze water faucets to drain water in pipes into the ground to prevent freezing. The so-called piston type, which is easy to operate and can be expected to produce a large flow rate, as in Utility Model Publication No. 45-20618 by humans.
Cylinder-type antifreeze faucets are increasingly being used. However, since a large flow rate is obtained, in some areas, especially in high-pressure areas, when opening the faucet, one has to be careful about water splashing, and when the faucet is closed, there is a vibration noise caused by water hammer. Problems such as damage to piping joints also arise.

Therefore, as shown in Fig. 3, it is conceivable to use a pressure reducing valve A for cold regions, such as the one disclosed in Utility Model Application Publication No. 13815/1983, for the purpose of reducing the pressure of water heaters, in the middle of the piping, but this is not possible. Even when draining water from the freezing faucet B, it is very difficult to operate, and you must consider the possibility of forgetting to drain the water and causing it to freeze, resulting in no water coming out or damage to plumbing fixtures. In addition, it is not used much because the cost is correspondingly high, and in reality, when closing the faucet, it is necessary to prevent water hammer from occurring.
We are careful to close the faucet slowly, or we operate the faucet while putting up with some inconvenience and inconvenience.
That was the current situation.

(Problems to be solved by the invention) In view of the above points, the present invention aims to provide a completely new device that eliminates all of the above-mentioned defects by providing the antifreeze faucet itself with a decompression function. The purpose is

(Means for Solving the Problem) Therefore, the present invention includes a piston-like valve body that reciprocates in a cylinder, a piston joint that opens and closes a drain port provided in the upper part of the valve box, and a spring between the piston joints and the lower end of the piston joint. The piston is movably connected through the valve body, and is divided into two pistons that open and close the inflow port provided in the middle part of the valve body and the outflow port provided in the lower part. The piston moves up and down due to the upward secondary pressure in the pressure chamber adjacent to the outlet, providing a pressure reducing function, and a drain passage leading from the outlet to the drain port is formed in the valve box parallel to the cylinder. This is what I did.

(Function) As described above, in this invention, while having the conventional function as an antifreeze faucet, the piston connected to the piston joint can also move up and down due to the upward force caused by the secondary pressure and the downward force caused by the spring. Since we can provide an unprecedented device that exhibits a pressure reducing function, there is no need to install a separate pressure reducing valve in the piping, thus reducing costs, eliminating the need for troublesome water draining, and allowing you to operate the faucet with confidence even in high pressure areas. It is possible to obtain an appropriate amount of water.

(Example) Next, the present invention will be explained based on an example shown in the drawings.

In FIG. 1, a valve box 1 has an inlet 2 on the side, an outlet 3 below the inlet, and a drain 4 at the top, and inside there are first to fourth cylinders 5, 6, Make 7, 8. Furthermore, cylinder 6,
A drainage preparation chamber 9 is provided between the cylinders 7 and 7, which communicates with the inflow port 3 via a drainage channel 10, and forms a secondary pressure pressure chamber 11 adjacent to the outflow port 3 below the fourth cylinder 8. The piston 12 is connected to the third and fourth cylinders 7,
Two ring-shaped gaskets 1 each sliding on 8.
3 and 14 are attached, and a narrow diameter portion 15 and a collar portion 16 are provided at the upper end. The piston joint 17 located above the piston 12 is connected to the first to third piston joints.
Three ring-shaped gaskets 18, 19, 20 that slide on the cylinders 5, 6, and 7 are installed, and the inside is hollowed out to form a spring housing chamber 21, and the lower end has a diameter slightly larger than the collar 16 of the piston 12. A support piece 22 having a hole is attached, and an E-ring 23 is seated on the upper end of the support piece 22. In other words, the flange 16 is E
The piston joint 17 and the piston 12 are locked by the ring 23 and are connected to each other so as to be movable up and down without coming apart. Furthermore, a spring 24 that is locked to the upper end of the spring storage chamber 21 and presses the collar 16
Thus, a downward force is constantly applied to the piston 12. Although not shown, the valve box 1 has a pipe 25
The piston joint 17 is connected to the upper operation part main body by a rod 26, and is connected to an operation stick such as a spindle by a rod 26, so that it can be moved up and down by rotation of the handle. Furthermore, an air hole 27 is formed in the piston joint 17 to open the spring housing chamber 21 to the atmosphere in the pipe 25, so as not to adversely affect the vertical movement of the piston 12.

The figure shows a state in which water is being dispensed using a faucet (not shown) installed at the end of the secondary piping on the downstream side of the outflow port 3, that is, water is flowing. The water is depressurized through the gap between the lower end of the cylinder 8 and the upper part of the ring-shaped packing 14 of the piston 12, becomes secondary water with a lower pressure than the primary water, flows into the pressure chamber 11, and flows downstream from the outlet 3. Water is being sprayed from the faucet through the side pipes. The secondary water on the outlet 3 side flows through the drainage channel 10 to the drainage preparation room 9.
However, the ring-shaped gaskets 19 and 20 attached to the piston joint 17 are in close contact with the second cylinder 6 and third cylinder 7, and there is no leakage from there. The secondary water in the pressure chamber 11 is giving a lifting force to the piston 12, but when the faucet is further opened from this state, the water pressure of the secondary water, that is, the secondary pressure decreases, so the lifting force on the piston 12 is reduced. decreases, and the piston 12 descends under pressure from the spring 24, increasing the flow rate. Conversely, when the faucet is closed, the secondary pressure increases, and the piston 12 moves upward while compressing the spring 24, decreasing the flow rate. When the faucet is completely closed, that is, when water is stopped, the secondary pressure is at its maximum, and the ring-shaped packing 14 comes into close contact with the fourth cylinder 8, and together with the ring-shaped packing 13, blocks the primary water from the inlet 2. It is necessary to select a spring 24 with an appropriate strength in advance so that the secondary pressure at this time becomes the set pressure. That is, since the upper part of the ring-shaped gasket 13 is open to the atmosphere, the piston 12 is moved by the upward force caused by the secondary pressure in the pressure chamber 11 and the downward force caused by the spring 24.
The secondary pressure is maintained at a constant set pressure by moving the piston 12 up and down and automatically adjusting the opening degree of the piston 12 relative to the fourth cylinder 8. Since the third cylinder 7 and the fourth cylinder 8 are configured to have the same diameter, when the water is stopped, equal water pressure acts on the ring-shaped gaskets 13 and 14 in opposite directions, and therefore the primary pressure fluctuates. Even if the piston 12 is moved, no upward force or downward force acts on the piston 12, and the secondary pressure does not fluctuate. In other words, it completely functions as a pressure reducing valve.

Next, when you want to drain the water in the secondary piping from the water flow state shown in the figure, by operating the handle, you can raise the piston joint 17 connected to the handle via an operating rod such as a spindle, and the rod 26. The downward force of the piston 12 caused by the E-ring 24 also decreases, and the collar 16 is further engaged with the E-ring 23, causing the piston 12 to rise as well.
It comes into close contact with the cylinder 8 to block primary water from the inlet 2. When the piston joint 17 is further raised, the ring-shaped packing 19 separates from the second cylinder 6, and the water in the secondary pipe passes through the drainage channel 10 and the drainage preparation chamber 9, and is discharged underground from the drainage port 4. . In other words, it becomes a draining state. In this state, the ring-shaped packing 18 is in close contact with the first cylinder 5, and the ring-shaped packing 20 is not detached from the third cylinder 7, so that water does not rise into the pipe 25 during drainage. Of course, it is necessary to prevent the ring-shaped packing 14 of the piston 12 from separating upward from the fourth cylinder 8.

Next, FIG. 2 will be explained.

FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the present invention in a water-flowing state, and the differences from FIG. 1 are as follows. Note that the same parts as in FIG. 1 are given the same reference numerals.

In this embodiment, the drain port 4 is connected to the drain preparation room 9.
piston joint 1
7 is fitted with two ring-shaped gaskets 18 and 19, and the lower part of the air hole 27 formed inside is expanded to form a valve chamber 29 that accommodates the ball valve 28.
A valve seat 30 is provided, which is in contact with the valve seat 30. The manner in which the piston 12 and the piston joint 17 are connected is reversed, a small-diameter support rod 15' connected to the piston joint 17 is inserted into the spring housing chamber 21 provided in the piston 12, and a roll pin 31 is attached to the tip. In other words, the piston joint 17 and the piston 12 are connected to each other by the roll pin 31 and the collar portion 16 so as to be able to move up and down without coming apart. A portion of the thread of the small diameter support rod 15' is removed to form a communication path 32 between the spring housing chamber 21 and the atmosphere within the pipe 25. Further, in order to adjust the strength of the spring 24, an adjustment screw 33 is screwed onto the lower end of the piston 12, and when adjusting the secondary pressure, the piston 12 is pulled out and the adjustment screw 33 is moved up and down. If the adjusting screw 33 is raised, the set secondary pressure will rise, and if it is lowered, the set secondary pressure will also fall. Ring-shaped gasket 1 when draining water
9 is separated upward from the second cylinder 6, and the water in the secondary piping is drained to the outlet 3 and the drain 1 as in FIG.
0, the water is discharged into the ground from the drain port 4 through the drainage preparation chamber 9, but at this time, some of the water tries to flow through the communication path 32 from the air hole 27 into the pipe 25; Since the ball valve 28 immediately rises due to the water flow and closes the valve seat 30, water is prevented from entering the pipe 25. In this state, it goes without saying that the ring-shaped packing 18 of the piston joint 17 and the ring-shaped packings 13 and 14 of the piston 12 are in close contact with the first cylinder 5, the third cylinder 7, and the fourth cylinder 8, respectively. Other operating modes are similar to those in FIG.

(Effects of the invention) As described above, in this invention, the antifreeze faucet itself has a pressure reducing function, so even in high-pressure areas, water hammer can be used without installing a separate pressure reducing valve or throttle valve in the middle of the piping. It can eliminate accidents, wasted water, and inconvenience when operating the faucet, and it has no adverse effect on drainage and can withstand use even in cold regions, and can be installed on the piston. Since the number of ring-shaped gaskets required is reduced, the frictional force is reduced accordingly, and this also has the advantage of stable operation over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention in a water-flowing state, FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the present invention in a water-flowing state, and FIG. The figure shows an example of conventional piping. 1 is a valve box, 2 is an inlet, 3 is an outlet, 4 is a drain, 5 is a first cylinder, 6 is a second cylinder, 7 is a third cylinder, 8 is a fourth cylinder, 10 is a drain, 11 is a pressure chamber, 12 is a piston, 13,1
4, 18, 19, 20, and 24 are ring-shaped packings, 17 is a piston joint, 24 is a spring, 25 is a pipe, and 26 is a rod.

Claims (1)

[Scope of utility model registration request] In an antifreeze faucet, in which a piston-shaped valve body connected to a rod moves up and down inside a cylindrical valve box connected to a pipe to shut off water and drain water, the valve box has a first valve inside the valve box, which is arranged in order from the top. to a fourth cylinder, and on the side, an inlet is provided between the third cylinder and the fourth cylinder, an outlet is provided below the fourth cylinder, and a drain port is provided above the third cylinder, and parallel to the cylinder. The piston-shaped valve body has a piston joint that is fitted with a ring-shaped gasket that closely seals the water in the first and second cylinders, and a lower end of the piston joint. The piston has a ring-shaped gasket that is connected to the third cylinder and the fourth cylinder so as to be movable up and down via a spring, and that seals the water in close contact with the third and fourth cylinders. A pressure reducing type antifreeze faucet characterized by forming a pressure chamber.